Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44b3a1708e74a01…

MALICIOUS

PDF

47.2 KB Created: 2020-08-04 03:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 994f0dc5178ffcbeae84c0109936b152 SHA-1: a7b0dc5e5e7358fd3188bd156731e180df5e3ec2 SHA-256: d44b3a1708e74a01f85359ed5fb7f2e86444bcdce602d75878c4c105648a6885
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of these links, https://ttraff.ru/pify?keyword=balanceamento+oxirredu%25C3%25A7%25C3%25A3o+exercicios+pdf, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=balanceamento+oxirredu%25C3%25A7%25C3%25A3o+exercicios+pdf
    • http://files.phoenixsportsclub.com.au/uploads/1/3/1/4/131453917/e8107fac18ba39.pdf
    • http://files.reflexinstitute.ca/uploads/1/3/1/0/131071256/1431724.pdf
    • http://files.sherrithewriter.com/uploads/1/3/1/8/131857442/c6e558ed304ed0a.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/sukiguruj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1307/8174/files/75748444491.pdf
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/lenaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/voxutazesip.pdf
    • https://cdn.shopify.com/s/files/1/0432/1837/0728/files/94110873424.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6150/files/69325537555.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/ninorezigaseg.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/xubevus.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/pogode.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3349/files/83472245995.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/ragesufiju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000575b.bin
d9eb4a6120ea016b30114cb131a3221ed83c26ec4383e7d40e50d43a01dc9751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x575B 2864 bytes
font_01_sfnt_off0000618d.bin
fcdf2d8b4b2d6ce18d1b32a9fab1f9d42503cfa7e296fe7df7b3739edb5ab0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618D 5920 bytes
font_02_sfnt_off000074c8.bin
ee2a4a399c04c0a16232d9e64d402b1b424f249d83a9faeb0ee0ce15753c3b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C8 10748 bytes
font_03_sfnt_off00009857.bin
55d5123ea2e30bb0b6c65147a9271c01f8e2f7536e5e1d4b1c7059638f0fddb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9857 16092 bytes

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